There is an interesting article in the Scottish Sunday Herald called, "Which star’s records are more likely to be used in torture?" The column references a study by Bruce Johnson and Martin Cloonan, who began their research fifteen years ago looking at Balkan instances of music used as torture. They found that songs with violent lyrics were rarely used. Instead, typical torture music includes
the likes of Bing Crosby, Cliff Richard, Whitney Houston, and Tammy WynetteI can definitely see that. They also point out that it's more about repetition and volume than specific content anyway.
The article also has its funny moments. A retail worker's union in Austria actually sued because they were forced to listen to looped Christmas music. They claimed it inflicted "psychological terror." Yes, really. No word on whether or not they won the suit. But it demonstrates yet again, how the definition of what is or is not torture varies wildly.